Electrical switch gear



Jan. 171, 1933. DAWES 1,894,816

ELECTRICAL SWITCH GEAR Filed June 15, 1931 FR D I Ficg Z as I:

Inventor: David RDQvies,

His Atcovneg.

Patented Jan. .17, 1933 PATENT OFFICE COMPANY, A CORPORATION'OF 'NENV YORK ELEornIcAL SWITCH GEAR h naationmm J'une- 15, 1931, Serial 544,436, and in Great Britain July 25, 1930. v

My invention relates to electrical switch- It gear, more particularly to electrical switchgear of-themetal clad type including a cir- 'c'nit breaker and means for disconnecting or isolating the circuit breaker with respect to anassociated circuit or circuits.

I Afrincipal objectof my invention is the provision of improved switchgear of the 4 1.6 aforesaid type arranged so that bodilymovemerit. of the circuit breaker is efi'ective to causeengagementi and disengagement of the disconnecting or isolating contacts relating the circuit breakerto'anassociated circuit or In accordance with; the present invention .the movable ortiongof the switchgear ina cluding the, clrcuit breaker is mounted for .bodilyrotative movement with respect to a vertical axis disposed, b' "way of example, intermediate a set of bus ar and branch circuitor cable end connections, or intermediate alternate sets of busbars, as main and auxiliary busbars, and/or branch circuit connec- 1 l tions, the circuit breaker being connected with or isolated fromithe'busbars and branch circuit connections, for selectively connected toalternate setsbfbusbars and/or branch circuit connections, asithecase maybe, by rotativemovement of the movable portion of the switchgear. p

.. In a preferred arrangement the circuit breaker is mountedso as to rotate about its vertical axis, the movabledisconnect ng contacts each depending from radial conducbreakerttank and ente in -a compartment,

tors mounted on thecover of thecircuit preferably oilrfilled, in. which the cooperating fixed contacts are disposed. A hood or ,cover member may likewise bemounted on 'the rotary portion of the switchgear so as efl'ectively to close at all times during operation the compartments in which the disconnecting contacts are located. Y In the event that alternate busbars are provided for selective connection to the cir- ,cuitbreakerand branch circuit or circuits,

.' they' may be conveniently arranged'on oppo- 5 sit eifsides of the axis of rotation of the rotary ..:portion of the switchgearand suitably connected'by laterally extending conductors to and to the other of said buses in the alternate position, complete isolation ofthe circult'breaker beingetfected by rotating the same to an intermediate position. In this position one of the movable disconnecting contacts may be arranged to engage a fixed grounding contact so that the circuit breaker is both isolated and grounded. y

In a polyphase arrangement the circuit breakers for the individual phasesarepreferably mounted in separate housings and are operated independently, suitable provision of. course being made for insuring synchrow nous operation. Likewise, the synchronous operation may involve a suitable interlocking system so that the disconnecting or isolating operatlons must be preceded by tripping of the. circuit breaker mechanism, as is well known in the art. 7

My invention will be more fully set forth in the following description referring to the S...

accompanying drawing, and the features of noveltv WlllGi'l characterize my nvention will be pointed out with particularity in the claims annexed to and forming apart of this The metal clad switchgear illustrated by.

way of example in Fig. 1 comprises a stationary structure 1 including the busbar and branch c1rcu1t connections and 'a movable portion2 including a circuit breaker and its associated mechanism 2', of the well known fluid-break or oil type. The movableportion 2 is mounted for bo-dlly rotative movedrawing, Fig. 1 is an elea loo h of'rotation being the vertical axis circuit breaker? comprises the conoilvfillcd tank 4 in the upper part of at: 713116 1 i su the lift rod IOand o 7- m ui rm ml mdfi areconnectfed to Al}, c tecl-ioFig.

I z 5 and 6 likewise i I 11 11* and 151 respective in disconnecting .con-

83s arrangecl to ooactwith simi: @zg'mdzs.

to F; 2.'the mm 27' ufib 1m flati b i the lower wall intothe oil filledica'sings i ice In n the bmbugiuncii sao @Wifi b c who m; mgxi mary e ou It an 85respecl6; Fig .3, parallel with each hg egton a torlitable 3 or the like,

7 emanner well known inithe'art.

- fi imshingsfi and 6 are the .f .v 38 'm movable bridging contact 9 which mounted above the hi -ea i isolgtinfi contiicts" I rt' 8mm i vain the movable, mm 19," toFip gthe other disconnectbest illustrated h h 22 and 21 form stationary; disconn Y c c o .h contact 19 is'ofcourse oiitio ial'hut-is other at opposite sides ofthe switchgear u d are supported at by similar supporting structures 20, the busbars being Slutably armored or sheathedi and in 1 t W1. i contacts 24 and 25, as to :a :1 11; abl" arid bell 37 through whic and the I Comma-1 'M I having bmnchiconnections I conn c contacts in-Figigi Afirrenttmrfgofict my. mmm 1 m cent the end bell 37L lhfi'hlilich l ,,-T,he branch circuit a; PSW? li m with W mew ppgitione parts of the circuit breaker may still be at a V dangerous potential.

Assuming now that the branch circuit or feeder cable 36 is to be connected to the main busbar 34: and that the circuit breaker 2 is open, the movable portion of the switchgear the above manner to the main and auxiliary busbars.

*WheI1 the feeder cable 36 is to be transferred from the main busbar 34 to the auxiliarybusbar 35 the circuit breaker 2 is first tripped open and the movable portion 2 rotated clockwise until the disconnecting coniacts 18 and 19 are in engagement with the stationary disconnecting'contacts 24 and 27 respectively, thereby connecting the cable 36 directly to the auxiliary busbar upon closing of the circuit breaker 2". As previously stated, suitable interlocking mechanism is provided for insuring making and breaking of the circuit by the circuit breaker 2, and

not at the disconnecting contacts, whichis cuit breaker having relatively movable contacts mounted for bodily rotative movement about its vertical ax1s,'a disconnecting con- 7 tact connected to each terminal of and carried by said circuit breaker and stationary disconnecting contacts coacting with the aforesaid disconnecting contacts in accordance with rotative movement of said circuit breaker.

2. Electrical switchgear comprising a movable portion including a circuit breaker having relatively movable contacts and a disconnecting contact connected to each terminal of said breaker and movable therewith, said movable portion rotatable with respect to a vertical axis, and stationary structure ineluding disconnecting contacts connected to a plurality of circuits, the aforesaid mov- Y able and stationary disconnecting contacts coacting in accordance with rotative movement of saidmovable port-ion. V

3, Electrical switchgear comprising an 011 circuit breaker having relatively movable contacts mounted for bodily rotative movement about its vertical axis, a disconnecting contact connected to each terminal of said breaker and movable therewith, and stationary disconnecting contacts coacting with said movable disconnecting contacts inac cordance with rotative movement of said cir cuit breaker. the aforesaid movable and stationary disconnecting contacts being immersed and operable within an insulating liquid separate from that in said circuit breaker. i a

4. Electrical switchgear comprising an oil circuit breaker having relatively movable contacts bodily "rotatable with respect to its vertical axisydisconnecting contacts carried by and movable with said circuit breaker connected to the terminals thereof, stationary structure including casings containing oil in which said movable disconnecting contacts are immersed, and stationary disconnecting contacts mounted within said casings and immersed in said insulating liquid, engagement and disengagement of the coacting discon necting contacts controlled by rotative movement of said circuit breaker. 1

5. Electrical switchgear comprisinga movable portion including a circuit breaker and disconnecting contacts mounted for rotative movement about a vertical axis, said discon necting contacts; overhanging said circuit breaker and depending therefrom at opposite sides, and stationary structure including a plurality of circuits, oil-containing casings individually receiving said movable disconnecting contacts, and stationary disconnecting contacts connected to said circuits and transversely positioned with respectto said movable contacts within said casings, the disconnecting contacts isolating or connecting said circuit breaker with respect to said circuits in accordance with rotative movement of said movable portion.

6. Electrical switchgear comprising stationary structure including disconnecting contacts connected respectively to main and auxiliary busbars and a branch circuit, and a movable portion including a circuit breaker carrying disconnecting contacts coacting with the aforesaid disconnecting contacts for selectively connecting said branch circuit to the main or auxiliary busbar, said circuit breaker mounted for bodily rotative movement for connecting said branch circuit to either the main or auxiliary busbar or isolating said circuit breaker.

7. Electrical switchgear comprising a circuit breaker rotatable about its vertical axis, a pair of disconnecting contactsmounted at opposite sides of said breaker and movable therewith, stationary structure including a pair of casings containing oil arranged at opposite sides of said breaker. spaced stationary disconnecting contacts mounted within 

